Model airplane propeller



Patented Aug. 23, 1938 2,128,009

UNITED STATES PATENT OFFICE 2,128,009 MODEL AIRPLANE PROPELLER Frank J. Merz, Jr., and George B. Merz, Seattle, Wash.

Application September 20, 1937, Serial No. 164,663 1 Claim. (01. 170-173 Our invention relates to model airplane proone of which-is shown in elevation at 9 in Fig. 2 pellers, and more particularly to a miniature airof the drawing. When the two parts of the proplane propeller that is transversely severed at peller are joined, these two faces are placed or its central hub portion, together with means fitted together to form a butt joint at 8 as will for securing the two severed parts together in the be understood. The usual hole In extends cen- 5 form of a butt joint at the center of the hub. trally through the hub portion 1, half of same The objects of the invention, in making a probeing in each severed part of the hub. Said hole peller in equal parts that are secured together forms a journal bearing for a propeller shaft H by a butt joint at the center of the hub, are that, which extends forward from the nose l2 of a when one of the propeller blades is broken, same model airplane which is not shown. 10 may be replaced at less expense than would be The simple means for securing the two severed incurred by replacement of the entire propeller. parts of. the propeller hub 1 together is the most In order to completely effect this saving of eximportant part of the invention. Said means pense, we have devised a simple, effective and may consist of a pair of disc plates l3 each having inexpensive means for securing together the an annular flange l4 extending at right angles severed parts of the propeller. from its periphery. A hole I5 is centrally pro- It will be expressly understood that our invided in each disc plate for reception of the vention is solely intended for use in connection shaft II. The hub 1 has an annular groove l6 with model and toy or other miniature airplanes cut in both its front and rear sides concentric With or propellers. It is not intended for use on full the hole I0, half of said groove being disposed in size propellers and would doubtless be of. no praceach severed part of. the hub. These grooves are tical value or utility for such use. Model and adapted to snugly receive the flanges M of the toy airplane propellers are usually made of wood disc plates I3. or light metal such as aluminum, and the objects In the assemblage of the severed parts of the of our invention relate exclusively to such propropeller, their severed faces 9 are placed to- 25 pellers. It will also be understood that model gether in abutment. The flanges M of each of airplanes are miniature planes that are flown by the disc plates l3 are then inserted into the anyoungsters as a source of amusement and skill, nular grooves IS in both the front and rear n v n of m y, lth u h small in amount, sides of the hub I. The disc plates are both means much to them. pressed inward, their flanges snugly fitting into 0 In the drawing: the grooves, and the two parts of the propeller Figure 1 is a view in front elevation of a model are thus held securely together. The propeller or toy airplane propeller that is severed and conmay then be installed on the shaft II with the nected together at its center, and also showing rear disc plate [3 bearing against an annular one of the propeller blades broken away in dotted shoulder l1 formed on said shaft, and. a nut I8 35 lines; may be installed on the outer threaded end of Fig. 2 is a view in central transverse vertical the shaft and bearing against the front disc plate section taken substantially on a broken line 2-2 l3 as clearly shown in Fig. 2 of the drawing.

of Fig. 1; and We claim: 3 is a de w in Perspective Showing An article of manufacture comprising a mini- 40 one member of the securing means. ature propeller having a hub with a center hole Referring in detail to the drawing wherein therein, said hub centrally and transversely like reference numerals indicate like parts in the severed to form equal parts with abutting faces several views, the numerals 5 and 6 respectively fitted together, a groove formed around the hole designate the two blades of a model or toy airin the hub on both the front and rear sides 45 plane propeller. These two blades are joined thereof, a pair of plates each having a right together at their center hub portion 1 which is angular edge flange, and the flange of each plate severed centrally and transversely as shown at 8 fitting into the groove of the hub on each of its in Fig. 1. The propeller may either be made respective sides for the purpose of securing the as a single unit and severed afterward, or it may severed parts of the propeller together in the form be made in two equal parts originally as desired. of a butt joint and as a unit in itself.

When the hub portion 1 of the propeller is FRANK J. MERZ, JR. severed centrally, two equal faces are formed, GEORGE B. MERZ. 

